/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lib_qrcode.zxing.app;

import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceScreen;
import com.lib_qrcode.R;
import java.util.ArrayList;
import java.util.Collection;

/**
 * The main settings activity.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class PreferencesActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener
{

	public static final String KEY_DECODE_1D = "preferences_decode_1D";
	public static final String KEY_DECODE_QR = "preferences_decode_QR";
	public static final String KEY_DECODE_DATA_MATRIX = "preferences_decode_Data_Matrix";
	public static final String KEY_CUSTOM_PRODUCT_SEARCH = "preferences_custom_product_search";

	public static final String KEY_PLAY_BEEP = "preferences_play_beep";
	public static final String KEY_VIBRATE = "preferences_vibrate";
	public static final String KEY_COPY_TO_CLIPBOARD = "preferences_copy_to_clipboard";
	public static final String KEY_FRONT_LIGHT = "preferences_front_light";
	public static final String KEY_BULK_MODE = "preferences_bulk_mode";
	public static final String KEY_REMEMBER_DUPLICATES = "preferences_remember_duplicates";
	public static final String KEY_SUPPLEMENTAL = "preferences_supplemental";

	public static final String KEY_HELP_VERSION_SHOWN = "preferences_help_version_shown";
	public static final String KEY_NOT_OUR_RESULTS_SHOWN = "preferences_not_out_results_shown";

	private CheckBoxPreference decode1D;
	private CheckBoxPreference decodeQR;
	private CheckBoxPreference decodeDataMatrix;

	@Override
	protected void onCreate(Bundle icicle)
	{
		super.onCreate(icicle);
		addPreferencesFromResource(R.xml.preferences);

		PreferenceScreen preferences = getPreferenceScreen();
		preferences.getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
		decode1D = (CheckBoxPreference) preferences.findPreference(KEY_DECODE_1D);
		decodeQR = (CheckBoxPreference) preferences.findPreference(KEY_DECODE_QR);
		decodeDataMatrix = (CheckBoxPreference) preferences.findPreference(KEY_DECODE_DATA_MATRIX);
		disableLastCheckedPref();
	}

	public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
	{
		disableLastCheckedPref();
	}

	private void disableLastCheckedPref()
	{
		Collection<CheckBoxPreference> checked = new ArrayList<CheckBoxPreference>(3);
		if (decode1D.isChecked())
		{
			checked.add(decode1D);
		}
		if (decodeQR.isChecked())
		{
			checked.add(decodeQR);
		}
		if (decodeDataMatrix.isChecked())
		{
			checked.add(decodeDataMatrix);
		}
		boolean disable = checked.size() < 2;
		for (CheckBoxPreference pref : new CheckBoxPreference[]
		{ decode1D, decodeQR, decodeDataMatrix })
		{
			pref.setEnabled(!(disable && checked.contains(pref)));
		}
	}

}
